Crowning and concaving device for roll grinding machines



Dec. 17, 1935. H. E. BALSIGER CROWNING AND CONCAVING DEVICE FOR ROLL GRINDING MACHINES 4 Sheets-Sheet l mvENToR Ha/wfd 6.54%.

Filed March 51, 1932 ATTORN E Y Dec. 17, 1935. H. E. BALSIGER CROWNING AND CONCAVING DEVICE FOR ROLL GRINDING MACHINES Filed March 51, 1932 4 Sheets-Sheet 2 llllllllullllllllllllllllll INVENTOR ATTORNEY Dec. 17, 1935. H. E. BALSIGER 2,025,010

' v CROWNIN G AND CONCAVING DEVICE FOR ROLL GRINDING MACHINES 4 Sheets-Sheet 5 IHIIIIIIIHH Filed March 51, 1952 INVENTOR Dec. 17, 1935. H. E. BALSIGER 2,025,010

CROWNING AND CONCAYING DEVICE FOR ROLL GRINDING MACHINES Filed March 51, 1932 ,4 Sheets-Sheet 4 Hum I amen 1M Elk/coma;

HaroldZBa Z4190! Patented Dec. 17, 1935 UNITED STATES PATENT OFFICE Harold E. Balsiger, Waynesboro, Pa., assignor to Landis Tool Company, Waynesboro, Pa., a corporation of Pennsylvania pplication March 31,

8 Claims.

This invention relates to devices for grinding concaved and crowned surfaces on mill rolls and its object is to provide in a grinding machine, a means for accurately tilting the grinding wheel support relative to its supporting base through each increment of movement imparted thereto so as to produce a concavity or crown on the mill roll which has the same curvature at opposite sides of the center of the roll but in reverse relation to each other.

A further general object is to provide a mechanism of the kind described having a minimum number of working parts and provide further means for eliminating friction between moving parts.

Theinvention is a variation of and an improvement over that shown in patent to Harper A. Good, No. 1,904,827, granted April 18, 1933.

Referring to the accompanying drawings, which 20 are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a rear view in elevation of the tilting mechanism,

Figure 2, an end elevation of the same,

Figures 3 and 4 are details showing the range of movement of the tilting mechanism for concaving and for crowning respectively.

Figure 5 is a view in elevation somewhat diagrammatically showing a wheel base and wheel support showing my invention applied thereto.

Since the invention in the present application relates specifically to the means for tilting the wheel base in a roll grinding machine only so much of the structure will be shown as is necessary to understand this particular apparatus.

In the drawings a grinding wheel is indicated at 3| and the work operated upon is indicated at 32. The grinding wheel is mounted for rotation on the grinding wheel support II], which is pivoted at to the usual traversing base or carriage 33. The grinding wheel support it is provided with a bracket H which is preferably formed integral therewith and in this bracket is mounted a movable slide l2. This slide is adjustable vertically and held in adjusted position by means of a screw I3 threaded through a lug M on the slide l2 and held between lugs l5 and IS on the wheel support l0. Hardened washers l1 and I8 may be held between the shoulders on 50 the screw and the lugs and I6 respectively. The purpose of the adjusting screw just described is to keep the wheel support in central position or horizontal regardless of the position of the operating crank pin later to be described. The slide l2, as illustrated in the accompanying 1932, Serial No. 602,298

drawings, carries at its lower end a roller I9, the axis of which is parallel with the axis ID of the Wheel supporting carriage. This roller [9 makes engagement with an eccentric lifting mechanism comprising a ball bearing element carried by 5 a crank pin 2| which is in turn carried by a block 22. The block 22 is carried by a wheel 23 and is adjustable eccentrically of the wheel by a screw 25. By a turning of the screw the eccentricity of the pin 2| may be varied and thus the 10 depth of the concavity or height of the crown of the mill roll varied. The extent of the eccentricity is indicated by a graduated scale 24. The shaft 26 carrying the wheel 23 at its outer end is driven in any suitable way, as by means of 15 a worm 21 and worm wheel 28, all of which is shown more in detail in the patent to Good, above referred to.

The axis of rotation of the eccentric is at right angles to a vertical plane containing the pivotal 20 axis of the wheel support. The follower roll I9 is mounted directly above said lifting element and makes direct contact therewith so that at the vertical limit of movement of the element 28 in both directions, the point of contact between the element and follower l9 lies in a line through the center of the shaft 26. Due to this arrangement, the wheel support 10 is lifted exactly the same distance when the element 20 is oscillated through equal angles of movement on opposite sides of the 30 point of maximum lift.

- While a roller is shown as carried by the slide l2 and contacting with the lifting element, it will be understood that the follower may beotherwise constructed. It is essential, however, that the surface of the follower and the surface of the eccentric shall be shaped relative to each other so as to provide a point contact between the two.

It is the arrangement of the eccentric lifting element, so that its axis of oscillation is perpendicular to the axis about which the wheel support is tilted and the shaping of the follower and lifting element so as to provide a point contact only therebetween, together with the disposition of the follower relative to the lifting element so that the point of contact at maximum point of lift is directly over the axis of oscillation of said lifting element that brings about an accurate tilting movement of the grinding wheel support which results in the production of a concavity or crown on the mill roll which has the same curvature on the opposite sides of the center of the roll but, of course, in reverse relation to each other.

A jack 29 is provided for lifting the Wheel supbeing substantially perpendicular to each other,

55 '5 roll mounted thereon, means for moving the tool Good patent above referred to.

Figures 3 and 4 show the positions of the crank pin for concaving and for crowning respectively.

In Figure 3 the dotted circles A and B indicate the range of movement of the pin during concaving of a roll and dotted circles C and D the range of movement of the pin during the crowning of a roll.

and the vertically movable block 12' on the wheel support. The ball bearing elements 30 eliminate friction due to rotation of the element 20 but this would not eliminate any friction laterally on the surface of the bearing element 20 due to the tilting of the wheel support. The rolling contact provided by roller I9 eliminates this lateral friction and hence provides for a more nearly frictionless machine throughout.

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawings and described in the specification, but only as indicated by the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

gated roller rotatably mounted in said vertical slide and adapted to engage said oscillating roller, said elongated roller having its axis substantially at right angles to the plane of movement of said support, the axes of said rollers substantially as set forth.

2. In a roll grinding machine, a pivotally mounted wheel support, means for tilting said support, comprising an elongated roller rotatably and adjustably mounted on said support, the aXis of said roller being substantially parallel with the axis about which the support is tilted, an eccentrically mounted oscillating roller adapted to engage said first mentioned roller with the axes of the roller substantially perpendicular to each other, substantially as set forth. 7

3. In a machine of the kind described for generating a crown or concave surface on a roll, a support having a tool for operating upon the toward and from the roll comprising a block adjustably mounted in the tool support, said block having a roller'mounted thereon, an oscillating shaft having an eccentric mounted thereon, said eccentric having its periphery directly engage able with the said roller, the axis ofoscillation of said shaft being parallel with the direction of movement of the tool toward and from the work,

and the axis of said roller being substantially at right angles to the axis of said eccentric, substantially as set forth.

4. In a machine of the kind described a wheel support, a wheel spindle mounted in said support,

, a work support, means for moving the wheel sup- By reason of the roller l9 fric-, tion is lessened between the ball bearing element port toward and from the work support comprising a roller rotatably mounted on said wheel support with its axis substantially parallel to the axis of the wheel spindle, an eccentric lift ing mechanism having its periphery in engagement with said roller, the axis of rotation of said eccentric being perpendicular to the axis of rotation of the wheel spindle.

5. In a machine of the kind described, a pivotally mounted wheel support, a work support, means to pivot said wheel support toward and from the work piece comprising a roller rotatably mounted on the wheel support with its axis substantially parallel to the pivotal axis of the Wheel support, an. eccentric lifting mechanism having its periphery in engagement with said roller, the axis of rotation of said eccentric lying in a plane which is perpendicular to the axis of the pivot of the wheel support.

6. In a grinding machine, a base, a wheel support pivotally mounted on said base, means for tilting said support comprising an eccentric lifting element, means for oscillating said eccentric lifting element about an axis included in a plane at right angles to the axis of the wheel support, a roller follower on said wheel support with its axis parallel to the axis of the wheel support, said roller follower being disposed substantially directly above the center of oscillation of said lifting element whereby the point of contact between said lifting element and said roller at the maximum point of lift of the lifting element is directly over the center of oscillation.

7. In a grinding machine, a base, a wheel support pivotally mounted on said base, a grinding wheel mounted thereon,- means for tilting said support toward and from. a work piece during the grinding thereof comprising an eccentric lifting element having a curved periphery, means for oscillating said lifting element about an axis at right angles to the axis of the wheel support, a follower element on said wheel support contacting with said lifting element, one of said elements having the contacting surface thereof curved in a direction at right angles to the curved periphery of said eccentric, whereby said follower will have a point contact only with the said lifting element, said follower being disposed relative to said lifting element so that the point of contact at the maximum point of lift is directly over the axis of oscillation-of said lifting element.

8. In a grinding machine, a base, a wheel support pivotally mounted on said base, a grinding wheel mounted thereon, means for tilting said support toward and from a work piece'during grinding thereof, comprising an eccentric: lifting element, means for oscillating said lifting element about an axis at right angles to the axis of the wheel support, a follower on said wheel support contacting with said lifting element, the contacting surface of said follower being curved about an axis at right anglesto theaxis of said eccentric lifting element whereby said follower will have point contact only with said lifting element,

said follower being disposed relative to said lift ing element so that the point of contact at maximum point of lift is directly over the axis of oscillation of said lifting element. I

HAROLD E. BALSIGER. 

